This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A138214 #2 Mar 30 2012 18:37:09
%S A138214 1,1,4,38,596,13137,373544,13008184,535947320,25492727304,
%T A138214 1374588760980,82844371459764,5518323917106220,402556752045926108,
%U A138214 31916585459440839392,2732642735337686840152,251267557458318511262096
%N A138214 G.f.: A(x) = 1 + x*(1 + x*(1 + x*(...(1 + x*(...)^(4n))...)^12)^8)^4.
%e A138214 G.f.: A(x)=1+x*B(x)^4, B(x)=1+x*C(x)^8, C(x)=1+x*D(x)^12, D(x)=1+x*E(x)^16,...
%e A138214 where A(x),B(x),C(x),... are the g.f. of the sequences given below.
%e A138214 A=[1,1,4,38,596,13137,373544,13008184,535947320,25492727304,...];
%e A138214 B=[1,1,8,124,2792,81462,2902528,121830916,5880235184,...];
%e A138214 C=[1,1,12,258,7612,278991,12084552,600710380,33615167976,...];
%e A138214 D=[1,1,16,440,16080,711740,36459968,2105685752,134824193120,...];
%e A138214 E=[1,1,20,670,29220,1517725,89938984,5933795760,429195194520,...];
%e A138214 F=[1,1,24,948,48056,2866962,193128768,14351122716,1159330814736,...]; ...
%o A138214 (PARI) {a(n)=local(A=1+x+x*O(x^n)); for(j=0, n-1, A=1+x*A^(4*(n-j))); polcoeff(A, n)}
%Y A138214 Cf. A095793, A138211, A138212, A138213, A138215, A138216.
%K A138214 nonn
%O A138214 0,3
%A A138214 _Paul D. Hanna_, Mar 06 2008